Internal-combustion engine.



J. B. WALKER.

INTERNAL. GOMBUSI'ION ENGINE.

APPLIOATIOH FILED APB. 6, 1912.

BVA/M.

ATTORNEYS WlT/VESSES To 'all whomit may Gouderak i Application filed April 6, 1912. Serial No. 688,852.

Be it known thatI, JESSE BRWNVALKER, a citizen of the United States, and a` resident of Savannah, in the Acounty `of Hardin and State of rv'1"e`nness'ee', have invented certain new anduse'ful Improvements in Internal- Combustion Engines, of which the following, is a'specication. l

" -My present invention relates to internal combustion engines, and vmore particularly to those of the four-'cycle type, my general object being toproduce a structure by which increased power may be obtained, and which will,` at the same time entail but minimum struction.

Specifically my 'improvements consistfin, providing an enlarged eXpcsion. chamberwith which one end of the piston 'cylindervcommunicates, ad with which the usual intake and exhaust ports have valved c0mmu-l supplementary"intake part 4having valyedr. communication; withfthe crankcase and;` a y valved" by-,pass communicating between the crankicase the piston`cylinder the mouthL of which ""is' uncovered bythe j oiston at `one the above object andaccompl-ish certain' ad-l vantagesas will belhereinafter described in connection with lthe accompanying drawing, in which the'figure is a Central vertical sec,l tion'thr'ou'gh an engine constructed in accordance with my invention.- f Referring now to this drawing, the crank case A supports theusual power shaft liutoA the crank b of which is connected the inner end of the pitman C, the outer end of which is connected to the cross pin (Z- of the piston 1D. The power shaft B also carries a gear wheel b which is in mesh with an enlarged gear wheel e, the latter being secured upon a shaft E extending also into, the crank case and provided therein with a cam'- e for a purpose which will be hereinafter particularly referred to.

The casing F of the engine, which is superposed upon the crank casev A, is provided with a piston cylinder f in which the piston D travels and which opens at its lower and into the crank case A. The cylinder f is further provided with an upperl enlarged explosion chamber f into which the upper end of the pistonfcylinder opens andv with which the intake and, exhaust ports G and H- respectively communicate,

the-intake valve ggis normally ward stroke of the a specmcnne'f Lefter's'ratnt; Patentedvfnee. 29, 1914.,

through their valves gend h. These valves open inwardly into the explosion chamber f asshown, and held closed by meansfof its spring g 'which permitsfthe A same to open when a vacuum is produced in the explosion chamber by the downward in'- piston D preceding each explosion stroke.V

vtake port the casing F is provided with :ausupplemental intake port' I 'which communicates` withtheicrank case A through anadditional and inwardly opening valve z'` normally held by Vits spring-WS4 'Diametr'inication, 'and in thefu'rther provision of a, 7

The 1exhaust valve z i s` held-:closed Yby its vspring z 'at all times eX- y cept .when the cani e engagesthe'roller ha at the lower end of the elongated valve rod h2, the -action of which 'is to 'open valve h v against the vtensionof: spring h change or Vdeparture from the usual ,coni

Y v: I

` JESSE fsaowir wALKnQrg-or SVNNAH, TENNESSEE; i

cally* oppositeA to` the supplementalintake port Lthe casing'F'- is provided with a by they crank case, and the upper end 'of which `communicates'withv the piston cylinder f `at a. point' slightly above .the upper end of endoffthe stroke'offtheflatter. Throughkthe intended operation oftliese par tsjI attain .theLpiston D when the latte'risfat the end 1 of its `inward or downward stroke. `The' by-passJ is provided -with a .valvej which is normally held closed lby means of its spring" jyand which controls communication between the crankj cas'eand the piston cylinder.. v fr v 1 t The explosion is'- produced through the usual spark plug K which is let into the topof the casing F at a point substantially central of the explosion chamber f and the respective end of the piston cylinder f. When an explosion takes place, the piston D moves inwardly and downwardly under the eii'ect thereof, and during this cycle of the operation, the intake valve g and the bypass valve jare held closed by means of the pressure in the explosion chamber and engine cylinder incident to the explosion. Upon theI outward movement of the piston vD' corresponding to the second cycle of its operation, and the moment the mouth of the by-pass J is closed thereby, the exhaust valve 7L is opened through the mechanical connections previously described, so that the pressure in the explosion chamber and engine cylinder is at once relieved and the burnt gases forced outwardly through the exhaust port during the succeeding movement of lthe piston'in the same cycle. Dur-k .or at least filled to an extent possible to lill the same by thesuctioncreated by the downward movement of the piston. As before mentioned, however, I have enlarged the explosion chamber to a considerable extent,`

for the purpose of obtaining increased powerat eachfexplosion, without materially increasing the size or weight of the engine as a whole, and to further this end, the

downward movement of the piston u on its third cycle uncovers the mouth of t e bypass J, and inasmuchas the ex losion chamber at this time `is filled wlth fresh gas vwhich is at atmospheric pressure only, the 'pressure within the' crank case, occasioned by two suctions through the valve e', is sufficient to force valve j open and pumpen c additional charge, Aunder pressure, into the explosion chamber. Thus, when' the piston v ascends upon its fourth cycle of movement,

the enlarged explosion chamber is filled not only `with a supply of gas sucked in at atmospheric pressure, but also -with a supply of gas pumped therein and under' pressure.

The result is that an explosion takes place having considerably greater`- ower over the `ordinary engine, by virtue o the increased number of enerf'r 1 producingfunits, this ex.- plosion being eected by the plug K when the upperend ofthe piston D has reached afpoint substantially evel' with the upper end of the piston cylinder f.

It' will be apparent lfrom the foregoing more rich or that I obtain a mixture the explosion chamber which comprises gas aty atmoslpheric pressure'and compressed, and I have found thatthismixture, togetherl with .an enlarged explosion chamber, is productive of better results and greater power than 1s produced in the usual four-cycle engine. I

have also found that by the 'joint action of the parts a more evenand uniform suction on the carbureter is effected, which in turn produces'a'better and more uniform charge, more especially where the charge iseither poor than normal.-

I cla im with a casing having a piston cylinder, a

` shallow annularly enlarged explosion chamber" at one end of the lpiston cylinder, provided with a valved' fuel intake port at one,

side and a valvedexhaust port at 4the oppcsite'side, -the valves'y of .both of which ports open into the 'explosion chamber, mechanical connections for opening the valve ofthe exhaust port, a piston inthe cylinder, a closed crank ca'se at the opposite en'd of the cylinder having a 4valved fuel intake port, said casing also having ya valved bypass communicating between the crank case and the piston cylinder V4at a `point in the latter adjacent the inner limitfof movement of the iston, and means for exploding the. charge int-he explosion chamber, said crank case intake port and said by-,pass being formed in the casing along the piston cylinder upon diametrically opposite sides thereof, and the valves thereof opening i11- wardly whereby said valvestogether with the valves of the explosion chamber intake may be controlled by springs alone to opere' the desiredl ate automatically in supplying charge to the piston cylinder.

yJESSE BROWN WALKra'z.`

R. L. HAMILTN,Y ,4

WInLmMs.

' to VIna four cycle engine, the combination 

